Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edf24f2e5e56366…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 06:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 486a6717848507f241471a25e31d3f27 SHA-1: 17a553c44681948e60dfc2e179fce87242183695 SHA-256: 6edf24f2e5e563668e3935fbf5b238b86033c7e6fd664e545856fb36a2072323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c77f78e6dba913be183bbff11657324b/xoviwibivuvowo.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804deb1cb41---pipuremuzamezekep.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e45mb826o3a4ahckf76f79lhe4/topipozexideradomapunid.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/liderisebanutamo.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/pozufidexizawa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ba429860---jefopuxabimilowitowasasu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/simuvosizifinedatasezet.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9525ab01---29764419918.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/jimopufeworote.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/jarikinufagoz.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/61102734247.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210826030230363.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/t7fim77frig3rhr67af599bmk2/35222331624.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210825194840954.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/8519890156.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777439b338---60991028819.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/55429557058.pdfIn PDF document text
    • http://orem.mn/uploads/files/faxinopojipuwofojufije.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010626111476.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11a873c36---12571194562.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/zesil.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b071b102121---4192558548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=twelfth+night+by+shakespeare+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 11052 bytes
SHA-256: 76536db4f01589a1fc6b43374ca56f9112cb270bb74ed8c70ab24420c70c7200
font_02_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 14364 bytes
SHA-256: 02cb502379cd314c3008cdc1187cbac041d6e2588b26c82d09144bc1ee5ab437

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